Heat Treatment Optimization and Nitriding Effects on Mechanical Properties of 32CrMoV12-10 Steel

Year 2024, Volume: 7 Issue: 2, 123 - 140, 04.10.2024

Fatih Demir , Muhammed Bora Akın , Ahmet Yartaşı

https://doi.org/10.58692/jotcsb.1402484

Abstract

32CrMoV12-10 steel is widely utilized in industries where high strength and toughness are crucial. This alloy is commonly used in manufacturing components like gun barrels, gears, and bearings, which demand exceptional mechanical properties. These parts typically undergo heat treatments, including hardening and surface enhancement techniques such as nitriding, to extend their fatigue life significantly. It is crucial to identify optimal heat treatment conditions to achieve desired material performance. In this study, commercial 32CrMoV12-10 steel was selected to investigate the impact of heat treatment parameters (temperature, duration time, and quenching media) on its mechanical properties. To analyse the effect of these parameters, the Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) and the Taguchi Method were employed, facilitating a systematic examination of the process stages and subsequent mechanical testing outcomes, including Charpy V-notch impact, hardness, and tensile strength assessments. An optimal heat treatment protocol was established based on these analyses, and the nitriding depth of the optimally treated sample was examined using a micro-Vickers hardness tester. For comparative analysis, another sample with closely related outcomes was also evaluated. Results indicated that the surface hardness of the optimally treated Sample 10 reached 870 HV, with a core hardness of 417 HV, compared to non-nitrided Sample 3, which showed a surface hardness of 860 HV and a core hardness of 415 HV. Despite the proximity in their values, Sample 10 exhibited slightly higher micro-Vickers hardness than Sample 3. However, while Sample 3 fails to meet the specified tensile stress and hardness criteria, Sample 10, produced through optimization, meets criteria, ranging from 970 to 1040 N/mm², underscoring the efficacy of the optimization process facilitated by TOPSIS. This optimization was notable for its minimal experimental requirements, proving effective in conserving time, energy, and resources while investigating the processed material.

Keywords

32CrMoV12-10 steel, TOPSIS-based Taguchi Method, Heat treatment, Nitriding, Mechanical properties

References

• ARMAD - https://www.aubertduval.com [Accessed 5th June 2022].
• Almeida EAD, Costa CE, & Milan JCG. Study of the nitrided layer obtained by different nitriding methods. Matéria (Rio de Janeiro). 2015:20(2): 465.
• Bakdemir SA, Özkan D, Türküz MC, Uzun E, & Salman S. Effect of the nitriding process in the wear behaviour of DIN 1.2344 hot work steel. Journal of Naval Sciences and Engineering. 2020:16(1): 45-70.
• Callister WD & Rethwisch DG. Materials Science and Engineering: An Introduction, 8th ed.: John Wiley & Sons; 2009.
• Cengiz M. Hardox 400 Çelik Yüzeyinin Plazma Transferli Ark Kaynak Yöntemiyle Alaşımlandırılması ve Taguchi Metoduyla Değerlendirilmesi. Dicle University Journal of Engineering (DUJE). 2019:10(3): 969-979.
• Du H, Somers MAJ, & Agren J. Microstructural and compositional Evolution of Compound Layers during Gaseous Nitrocarburizing. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science. 2000:31A: 195-211.
• Canıyılmaz E, & Kutay F. Taguchı Metodunda Varyans Analizine Alternatif Bir Yaklaşım. Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi. 2003:18(3): 51–63.
• Ferreira L, Brunatto SF, & Cardoso RP. Martensitic Stainless Steels Low Temperature Nitriding: Dependence of Substrate Composition. Materials research. 2015:18: 622-627.
• Friehling PB, & Somers MAJ. Growth Kinetics of the Compound Layer on Gaseous Nitriding of Iron: The Effect of the Surface Reaction in Mass and Carge Transport in Inorganic Devices: Fundamentals to Devices (Part B). Techna Srl; 2000.
• GÖKSU (2015). Web site. https://www.otuken.com.tr. [Accessed 3th January 2022]
• Gür AK & Kaya S. Abrasive Wear Resistance Optimization of Three Different Carbide Coatings by The Taguchi Method. Mater. Test. 2017:595: 450–455.
• HASCOMETAL - http://www.hascometal.com/teknik-bilgiler.aspx?ID=68 [Accessed 1st October 2021]
• HASÇELİK - https://hascelik.com/celik-hakkinda-genel-bilgiler/celik-nedir [Accessed 1st May 2022]
• Haefer R & Ilschner B. Oberflachen- und Dünnschicht- Technologie. Springer Verlag; 1991.
• Hwang CL & Yoon P. Multiple Attribute Decision Making In: Lecture Notes In Economics And Mathematical Systems. Springer Verlag; 1981.
• Joseph, R. Heat Treatments of Steels, 10th edition, ASM.: 91. 465 pages, American Society for Metals; 1973.
• Karslı M, Kemikoğlu U & Yavuz S. Tabanca Namlu Malzemesi 32CrMoV12-10 Alaşımına Uygulanan Gaz Nitrasyon ve Su Verme İşlemlerinin Darbe Dayanımına Etkisinin İncelenmesi. Gümüşhane University Journal of Science and Technology, 2021:11(4), 1198-1207.
• Kaya S. Yüzeyi Modifiye Edilmiş Ferritik Paslanmaz Çeliğin Aşınma Direncinin Taguchi Metoduyla Optimizasyonu. Master Thesis, Fırat University, Graduate School of Natural and Applied Sciences, 105 pages, Elazığ; 2017.
• Phadke M. Quality Engineering Using Robust Design Book, Library of Congress Catologing AT & T Bell Laboratories, New Jersey, USA; 1989.
• Şirvancı M. Kalite için deney tasarımı, Taguchi Yaklaşımı. Literatür Publications, 112 pages, İstanbul; 2011.
• Özay Ç. Teğetsel tornalama-frezeleme yönteminde işleme parametrelerinin teorik ve deneysel olarak araştırılması. PhD Thesis, Fırat University, Graduate School of Natural and Applied Sciences, Elazığ; 2009.
• Ross PJ. Taguchi Techniques for Quality Engineering, Loss Fuction, Orthogonal Exp. Param. Toler. Des., 279 pages., Mcgraw-Hill; 1998.
• Rutci AT. Development of Barrel Material Used in Light Weapons and Investigations of Manufacturing Process Parameters. Master Thesis, Sakarya University, Institute of Natural Sciences, Sakarya; 2019.
• Saklakoğlu N, Gençalp İrizalp S, İldaş G & Demirok S. Microstructure and wear properties of Fe-based hardfacing alloy / Fe esaslı sert kaplama alaşımının mikroyapı ve aşınma özelliklerinin incelenmesi. Celal Bayar University Journal of Science. 2016:12(3): 517-523.
• SIJ GROUP - https://www.sij.si/en/sij-brands/sinoxx/ [Accessed 1st October 2021].
• Şimşek B. Hazır Betonun Optimal Karışım Oranlarının Belirlenmesi İçin Bir Çok Yanıtlı Modelleme ve En İyileme Uygulaması: Topsis Tabanlı Taguchi Yaklaşımı İle Cevap Yüzey Yöntemi. PhD Thesis, Ankara University, Graduate School of Natural and Applied Sciences, Ankara; 2014.
• Tekin A. Çelik ve Isıl İşlemi Bofors El Kitabı. Hakan Ofset Publications, 616 pages, İstanbul; 1984.
• Toktaş G & Toktaş A & Duran, M. Investigating The Wear Behaviour of Induction Hardened 100Cr6 Steel. Sakarya University Journal of Science. 2018:225:1174-1180.
• Topbaş AM. Çelik ve Isıl İşlem El Kitabı. Ekim Ofset Publications, 553 pages, İstanbul; 1998.
• Uzkut M & Özdemir İ. Farklı Çeliklere Uygulanan Değişen Isıtma Hızlarının Mekanik Özelliklere Etkisinin İncelenmesi. Dokuz Eylül Üniversitesi Mühendislik Fakültesi Fen Ve Mühendislik Dergisi, c. 2001:3(3): 65-73.
• Yang M. Nitriding- Fundamentals, modeling and process optimization. PhD Thesis, Worcester Polytechnic University, Material Science and Engineering, Worchester/USA; 2012.
• Weststrate CJ. Hydrocarbon and Ammonia Chemistry on Noble Metal Surfaces. PhD Thesis, Leiden Universty Leiden Institute of Chemistry LIC, Faculty of Science, Leiden/Holland; 2006.